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SIGNIFICANT FIGURES
DEFINITION
THE TOTAL NUMBER OF DIGITS IN THE NUMBER IS CALLED THE NUMBER OF SIGNIFICANT FIGURE.
IMPORTANT POINT:
IT IS EQUAL TO THE NUMBER OF DIGITS
WRITTEN INCLUDING THE LAST ONE, EVEN
THOUGH ITS VALUE IS UNCERTAIN.
TABLE CONTENTS
DIGIT SIFGNIFICANT NUMBER RULE
101 3 (i)
0.101 3 (ii)
0.0101 3 (iii)
101.0 4 (iv)
101.00 5 (ii)
THE FOLLOWING RULES SHOULD BE FOLLOWED
IN COUNTING THE SIGNIFICANT FIGURES.
RULES
RULE NO:1
1. ALL DIGITS ARE SIGNIFICANT EXCEPT
ZERO AT THE BEGINNING OF THE
NUMBER.
2. THE ZEROS TO THE RIGHT OF THE
DECIMAL POINT ARE SIGIFICANTS.
RULE NO:2
Significant figures in numerical calculations
• RULE 1:
• SIGNICANT FIGURE RULE IN MULTIPLICATION/DIVISION
14.79×12.11×5.05
904.48985
=
904.48985
=
9.04× 104
ROUND OFF
Significant figures in numerical calculations
• RULE 2:SIGNICANT FIGURE RULE IN aDDITION/SUBTRACTION
22.2+2.22+0.222 = 24.642
24.6
=
Significant figures

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Significant figures